Body IDL harness tests failing while interfaces appear implemented

[gterzian]

https://github.com/servo/servo/blob/14303bd651e248e6e7a73759d622658088f9ddf1/tests/wpt/metadata/fetch/api/idlharness.any.js.ini

While Response and Request both implement the Body mixin(see methods like Json).

Not sure why.

[jdm]

Which specific test failures in the ini file are you referring to here?

[jdm]

I tried commenting out some of the metadata entries for blob/formdata etc.

  FAIL Response interface: operation blob() - assert_unreached: Throws "TypeError: "this" object does not implement interface Response." instead of rejecting promise Reached unreachable code
throwOrReject/<@http://web-platform.test:8000/resources/idlharness.js:116:33
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:1977:25
throwOrReject@http://web-platform.test:8000/resources/idlharness.js:115:20
IdlInterface.prototype.do_member_operation_asserts@http://web-platform.test:8000/resources/idlharness.js:2551:26
IdlInterface.prototype.test_member_operation/<@http://web-platform.test:8000/resources/idlharness.js:2471:14
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:1977:25
IdlInterface.prototype.test_member_operation@http://web-platform.test:8000/resources/idlharness.js:2419:12
IdlInterface.prototype.test_members@http://web-platform.test:8000/resources/idlharness.js:2729:26
IdlInterface.prototype.test@http://web-platform.test:8000/resources/idlharness.js:1587:10
IdlArray.prototype.test@http://web-platform.test:8000/resources/idlharness.js:906:28
idl_test/</<@http://web-platform.test:8000/resources/idlharness.js:3470:31
  FAIL Response interface: operation formData() - assert_unreached: Throws "TypeError: "this" object does not implement interface Response." instead of rejecting promise Reached unreachable code
throwOrReject/<@http://web-platform.test:8000/resources/idlharness.js:116:33
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:1977:25
throwOrReject@http://web-platform.test:8000/resources/idlharness.js:115:20
IdlInterface.prototype.do_member_operation_asserts@http://web-platform.test:8000/resources/idlharness.js:2551:26
IdlInterface.prototype.test_member_operation/<@http://web-platform.test:8000/resources/idlharness.js:2471:14
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:1977:25
IdlInterface.prototype.test_member_operation@http://web-platform.test:8000/resources/idlharness.js:2419:12
IdlInterface.prototype.test_members@http://web-platform.test:8000/resources/idlharness.js:2729:26
IdlInterface.prototype.test@http://web-platform.test:8000/resources/idlharness.js:1587:10
IdlArray.prototype.test@http://web-platform.test:8000/resources/idlharness.js:906:28
idl_test/</<@http://web-platform.test:8000/resources/idlharness.js:3470:31

I suspect that this is another example of a test failure caused by #26774, given those error messages.

[gterzian]

Yes looks like it would be that issue(I was referring to the various methods like json, formData, and blob which are implemented and still fail the harness, and they do return promises).